Entertainment / Golf / Cavity-Back: (also 'perimeter-weighted') a style of club head where the mass is distributed more toward the perimeter (outside edges) of the club head in order to increase the effective size of the center of mass MORE

Science / Biology / Lungs: Sac-like structures of varying complexity where blood and air exchange oxygen and carbon dioxide; connected to the outside by a series of tubes and a small opening. In humans, the lungs are situated i MORE